.container{
    width: 800px;
    height: 600px;
    background-color: palegreen;
    margin: auto;
}
.men{
    float: left;
    width: 30px;
    height: 40px;
    position: relative;
    background-image: url("img/men.jpg");
    background-size: cover;
}
.boom{
    float: left;
    width: 30px;
    height: 24px;
    position: relative;
    background-image: url("img/boom.jpg");
    background-size:cover;
    display: none;
}